Critical dynamics of a spin-5/2 2D isotropic antiferromagnet

Details Critical dynamics of a spin-5/2 2D isotropic antiferromagnet Critical dynamics of a spin-5/2 2D isotropic antiferromagnet

2001-01-08

arxiv.org/abs/cond-mat/0101097v1

Physics

Condensed Matter

5 pages, 4 figures. Submitted to Physical Review B, Rapid Communications

Scientific paper

10.1103/PhysRevB.63.140401

We report a neutron scattering study of the dynamic spin correlations in Rb$_2$MnF$_4$, a two-dimensional spin-5/2 antiferromagnet. By tuning an external magnetic field to the value for the spin-flop line, we reduce the effective spin anisotropy to essentially zero, thereby obtaining a nearly ideal two-dimensional isotropic antiferromagnet. From the shape of the quasielastic peak as a function of temperature, we demonstrate dynamic scaling for this system and find a value for the dynamical exponent $z$. We compare these results to theoretical predictions for the dynamic behavior of the two-dimensional Heisenberg model, in which deviations from $z=1$ provide a measure of the corrections to scaling.

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